diff --git a/library/log4php/helpers/LoggerOptionConverter.php b/library/log4php/helpers/LoggerOptionConverter.php
deleted file mode 100644
--- a/library/log4php/helpers/LoggerOptionConverter.php
+++ /dev/null
@@ -1,232 +0,0 @@
-<?php
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- *       http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * @package log4php
- */
-
-/**
- * A convenience class to convert property values to specific types.
- *
- * @version $Revision: 1374617 $
- * @package log4php
- * @subpackage helpers
- * @since 0.5
- */
-class LoggerOptionConverter {
-
-    /** String values which are converted to boolean TRUE. */
-    private static $trueValues = array('1', 'true', 'yes', 'on');
-
-    /**
-     * String values which are converted to boolean FALSE.
-     *
-     * Note that an empty string must convert to false, because
-     * parse_ini_file() which is used for parsing configuration
-     * converts the value _false_ to an empty string.
-     */
-    private static $falseValues = array('0', 'false', 'no', 'off', '');
-
-    /**
-     * Read a predefined var.
-     *
-     * It returns a value referenced by <var>$key</var> using this search criteria:
-     * - if <var>$key</var> is a constant then return it. Else
-     * - if <var>$key</var> is set in <var>$_ENV</var> then return it. Else
-     * - return <var>$def</var>.
-     *
-     * @param string $key The key to search for.
-     * @param string $def The default value to return.
-     * @return string    the string value of the system property, or the default
-     *                    value if there is no property with that key.
-     */
-    public static function getSystemProperty($key, $def) {
-        if (defined($key)) {
-            return (string)constant($key);
-        } else if (isset($_SERVER[$key])) {
-            return (string)$_SERVER[$key];
-        } else if (isset($_ENV[$key])) {
-            return (string)$_ENV[$key];
-        } else {
-            return $def;
-        }
-    }
-
-    /** Converts $value to boolean, or throws an exception if not possible. */
-    public static function toBooleanEx($value) {
-        if (isset($value)) {
-            if (is_bool($value)) {
-                return $value;
-            }
-            $value = strtolower(trim($value));
-            if (in_array($value, self::$trueValues)) {
-                return true;
-            }
-            if (in_array($value, self::$falseValues)) {
-                return false;
-            }
-        }
-
-        throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to boolean.");
-    }
-
-    /**
-     * Converts $value to integer, or throws an exception if not possible.
-     * Floats cannot be converted to integer.
-     */
-    public static function toIntegerEx($value) {
-        if (is_integer($value)) {
-            return $value;
-        }
-        if (is_numeric($value) && ($value == (integer)$value)) {
-            return (integer)$value;
-        }
-
-        throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to integer.");
-    }
-
-    /**
-     * Converts $value to integer, or throws an exception if not possible.
-     * Floats cannot be converted to integer.
-     */
-    public static function toPositiveIntegerEx($value) {
-        if (is_integer($value) && $value > 0) {
-            return $value;
-        }
-        if (is_numeric($value) && ($value == (integer)$value) && $value > 0) {
-            return (integer)$value;
-        }
-
-        throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to a positive integer.");
-    }
-
-    /** Converts the value to a level. Throws an exception if not possible. */
-    public static function toLevelEx($value) {
-        if ($value instanceof LoggerLevel) {
-            return $value;
-        }
-        $level = LoggerLevel::toLevel($value);
-        if ($level === null) {
-            throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to a logger level.");
-        }
-        return $level;
-    }
-
-    /**
-     * Converts a value to a valid file size (integer).
-     *
-     * Supports 'KB', 'MB' and 'GB' suffixes, where KB = 1024 B etc.
-     *
-     * The final value will be rounded to the nearest integer.
-     *
-     * Examples:
-     * - '100' => 100
-     * - '100.12' => 100
-     * - '100KB' => 102400
-     * - '1.5MB' => 1572864
-     *
-     * @param mixed $value File size (optionally with suffix).
-     * @return integer Parsed file size.
-     */
-    public static function toFileSizeEx($value) {
-
-        if (empty($value)) {
-            throw new LoggerException("Empty value cannot be converted to a file size.");
-        }
-
-        if (is_numeric($value)) {
-            return (integer)$value;
-        }
-
-        if (!is_string($value)) {
-            throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to a file size.");
-        }
-
-        $str = strtoupper(trim($value));
-        $count = preg_match('/^([0-9.]+)(KB|MB|GB)?$/', $str, $matches);
-
-        if ($count > 0) {
-            $size = $matches[1];
-            $unit = $matches[2];
-
-            switch ($unit) {
-                case 'KB':
-                    $size *= pow(1024, 1);
-                    break;
-                case 'MB':
-                    $size *= pow(1024, 2);
-                    break;
-                case 'GB':
-                    $size *= pow(1024, 3);
-                    break;
-            }
-
-            return (integer)$size;
-        }
-
-        throw new LoggerException("Given value [$value] cannot be converted to a file size.");
-    }
-
-    /**
-     * Converts a value to string, or throws an exception if not possible.
-     *
-     * Objects can be converted to string if they implement the magic
-     * __toString() method.
-     *
-     */
-    public static function toStringEx($value) {
-        if (is_string($value)) {
-            return $value;
-        }
-        if (is_numeric($value)) {
-            return (string)$value;
-        }
-        if (is_object($value) && method_exists($value, '__toString')) {
-            return (string)$value;
-        }
-
-        throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to string.");
-    }
-
-    /**
-     * Performs value substitution for string options.
-     *
-     * An option can contain PHP constants delimited by '${' and '}'.
-     *
-     * E.g. for input string "some ${FOO} value", the method will attempt
-     * to substitute ${FOO} with the value of constant FOO if it exists.
-     *
-     * Therefore, if FOO is a constant, and it has value "bar", the resulting
-     * string will be "some bar value".
-     *
-     * If the constant is not defined, it will be replaced by an empty string,
-     * and the resulting string will be "some  value".
-     *
-     * @param string $string String on which to perform substitution.
-     * @return string
-     */
-    public static function substConstants($string) {
-        preg_match_all('/\${([^}]+)}/', $string, $matches);
-
-        foreach ($matches[1] as $key => $match) {
-            $match = trim($match);
-            $search = $matches[0][$key];
-            $replacement = defined($match) ? constant($match) : '';
-            $string = str_replace($search, $replacement, $string);
-        }
-        return $string;
-    }
-}